One feature I'd really like is the ability to differentiate (via the admincp) ad settings on a per client basis.

Basically here's our situation:

We rolled out a branded ad-free iOS app years ago at a cost of $1.99.
We would like to roll out the Android based ad-supported app for free.
We'd like to also add a branded ad-supported iOS app for free.

The problem is, we can't selectively turn ads on for these different clients.

We have to either make our paid app free and add ads (which would generate a lot of complaints from the users who paid $1.99), or make the Android app non-free, which isn't what we want to do.

So, any response from the developers regarding this? I'm sort of frustrated that I am basically forced to either burn my paid iOS users by changing the iOS app to ad supported (since Apple frowns upon doing Free and Paid versions of apps now that IAP is a thing), or releasing a paid version of my Android app (which I don't want to do since $1.99 pales in comparison to the sort of revenue we'd get from ads over years).

I'm not sure when you'd see it added into the project though. I've logged it into our internal bug tracker as an improvement request.

If IAP for ad removal is rolled into the app, please also include a way to gift it to users who previously had paid for the app? I can't just make our paid app free and add ads if I don't know which users previously had paid for it.